Diagnostik, einschl. Reaktionen

Soft phonon in BaTiO3

“…We repeated the same computation that Merten did as shown in the last part of $6, using the values of four E(TO), four E(LO), three A1(TO) and three Al(LO) mode frequencies given by Table I Table I(B). Thus, we solve the Merten's equations (24). The result of the computation is shown in Figure 11 as seven solid curves.…”

“…24 Provided that in a crystal neither true charge nor magnetic flux exists, from the Maxwell's equations, A lattice vibration may radiate FIR or curl E = dB/dt, thus the curl E = 0 is a static approximation.…”